— 34 — 



Ail body segments are set with small chitinous warts, those on 

 3 — 7 segments being the strongest and the most densely arran- 

 ged. In the internai anatomy I only will mention that the sali- 

 vary glands will appear as 4 long and strong, curled tubes 

 which stretch through most of the length of the larva (compare 

 fig. 7 A and B, figured in the same enlargement), the two tubes 

 on each side unité anteriorly and more anteriorly yet this com- 

 mon tube joins with that from the other side and debouch in 

 the hypopharynx. Tracheae are found, but the spiracles are 

 very small.. Length (distended) 5,5 — 6 mm. 



Fig. 7. — Agriolypus armatus WALK. 



A. Second larval stage. — B. Salivary glands of one side of this. 



C. Caddis-fly case showing the band formed by the parasite. — (AH figures enlarged X 10.) 



This larval stage is easily found in nature as the infested 

 caddis-fly cases display the curious band figured in fig. 7 C. 

 A caddis-fly case containing a mature larva of Agriotypus will 

 always appear closed anteriorly as well as posteriorly by the 

 common silk netting and closing stone, which signifies that the 

 parasite has allowed the host to do the last préparations for pupa- 

 tion, but immediately after that the caddis-fly larva has been 



